JPS61126360A - Forming method of flame sprayed film on piston - Google Patents
Forming method of flame sprayed film on pistonInfo
- Publication number
- JPS61126360A JPS61126360A JP59249130A JP24913084A JPS61126360A JP S61126360 A JPS61126360 A JP S61126360A JP 59249130 A JP59249130 A JP 59249130A JP 24913084 A JP24913084 A JP 24913084A JP S61126360 A JPS61126360 A JP S61126360A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- flame
- cavity
- sprayed film
- spray coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はピストンの溶射皮膜形成方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for forming a thermal spray coating on a piston.
従来、ディーゼルエンジンの燃焼室は第２図に示す構造
になっている。即ち、図中の１はシリンダライナ２を上
下動作するピストン、３は給気弁、４は排気弁、５はシ
リンダヘッド、６は燃料噴射ノズルである。また、図中
の７は前記ピストン１、シリンダライナ２、給気弁３、
排気弁４、シリンダヘッド５の夫々の燃焼室壁により形
成される燃焼室である。かかるディーゼルエンジにおい
て、燃焼室７に給気弁３から供給された空気はピストン
１のシリンダライナ２内での上昇によって圧縮され、高
温となる。この時、燃料噴射ノズル６から燃料を燃焼室
７内に噴射すると、該燃焼室７で圧縮された空気と混合
され、着火して燃焼する。Conventionally, the combustion chamber of a diesel engine has a structure shown in FIG. That is, in the figure, 1 is a piston that moves up and down the cylinder liner 2, 3 is an intake valve, 4 is an exhaust valve, 5 is a cylinder head, and 6 is a fuel injection nozzle. In addition, 7 in the figure indicates the piston 1, the cylinder liner 2, the air supply valve 3,
This is a combustion chamber formed by the combustion chamber walls of the exhaust valve 4 and the cylinder head 5, respectively. In such a diesel engine, air supplied to the combustion chamber 7 from the intake valve 3 is compressed as the piston 1 rises within the cylinder liner 2, and becomes high temperature. At this time, when fuel is injected into the combustion chamber 7 from the fuel injection nozzle 6, it mixes with the air compressed in the combustion chamber 7, ignites, and burns.
この燃焼エネルギによってピストン１が加工し、図示し
ないクランク機構に回転運動を与える。この後、ピスト
ン１が再びシリンダライナ２を上昇する際には、排気弁
４が開き、排気ガスを排出する。排気ガスは図示しない
過給機のタービンを回転させる共に、回収タービンを回
転させるエネルギ源として利用される。This combustion energy processes the piston 1 and gives rotational motion to a crank mechanism (not shown). Thereafter, when the piston 1 moves up the cylinder liner 2 again, the exhaust valve 4 opens and exhausts the exhaust gas. The exhaust gas is used as an energy source to rotate a turbine of a supercharger (not shown) and a recovery turbine.
上述したようにディーゼルエンジンの燃焼空白において
、燃料噴射ノズル６から噴射された燃料が燃焼すること
によって生じる火炎に直接接触するピストン１の触火面
は高温に曝される。また、ピストン１の触火面から熱が
燃焼室７の外部に逃げるため、効率の低下を招く。As described above, during the combustion period of a diesel engine, the ignition surface of the piston 1 that comes into direct contact with the flame generated by combustion of the fuel injected from the fuel injection nozzle 6 is exposed to high temperatures. Furthermore, heat escapes from the contact surface of the piston 1 to the outside of the combustion chamber 7, resulting in a decrease in efficiency.
このようなことから、ピストン１の下部から冷却油を噴
出させてピストン１が火炎に曝されるのを防止すること
が行われている。しかしながら、かかる構成では機構が
複雑となり、経済的、信頼性の上でも問題となる。For this reason, cooling oil is jetted out from the lower part of the piston 1 to prevent the piston 1 from being exposed to flame. However, such a configuration requires a complicated mechanism and poses problems in terms of economy and reliability.
本発明は、上記事情に鑑みてなされたもので、ピストン
の触火面に耐熱、断熱性を付与し得る高品質の溶射皮膜
形成方法を提供しようとするものである。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for forming a high-quality thermal spray coating that can impart heat resistance and heat insulation to the contact surface of a piston.
（問題点を解決するための手段〕
本発明は、キャビティを有するピストンの触火面に溶射
皮膜を形成する方法をおいて、前記ピストンの被溶射面
を粗面処理した後、該ピストンの上面を溶射し、ひきつ
づき前記キャビティの側面を溶射して溶射皮膜を形成す
ることを特徴とするものである。(Means for Solving the Problems) The present invention provides a method of forming a thermal spray coating on the contact surface of a piston having a cavity, and after roughening the thermal spraying surface of the piston, the upper surface of the piston is The present invention is characterized in that a thermal spray coating is formed by thermally spraying and then thermally spraying the side surface of the cavity.
上述した本発明方法によれば、キャビティを有するピス
トンの触火面に対して耐久性及び信頼性の優れた溶射皮
膜を形成でき、ひいては該ピストンを使用することによ
り高性能、＾信頼性の内燃機関を実現できる。According to the method of the present invention described above, a highly durable and reliable thermal spray coating can be formed on the contact surface of a piston having a cavity, and by using the piston, high performance and reliable internal combustion can be achieved. Institutions can be realized.
以下、本発明の実施例を第１図（ａ）、（ｂ）を参照し
て詳細に説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1(a) and 1(b).
実施例
まず、ボア径１３０ｍ＋の４サイクルデイ一ゼル単簡試
験機関のキャビティ１１を有するピストン本体１２の触
火面１３に粗面処理を施した。つづいて、粉末送給ボー
ト１４が付設されたプラズマ溶射ガン１５から８Ｑｗｔ
％Ｎｉ−Ｃｒの溶射粒子１６をプラズマジェット１７と
共に１．噴射して前記粗面処理された触火面１２に厚さ
０．２ｍ、８０ｗｔ％Ｎｉ−Ｃｒの溶射皮膜１８を形成
した（第１図（ａ）図示）。この時のブラ・ズマ溶射条
件は、プラズマアーク電流８００Ａ、プラズマアーク電
圧４０■、プラズマガス；Ａｒ５０ｊ２／ｍｉｎ ＋
１Ｈｅ２０λ／１ｎ、溶射距離１２０Ｍとし、
ピストン本体１２をその軸中心に１００ ｒ ｌ）ｍで
回転させ、プラズマ溶射ガン１５をピストン本体１２の
軸を通る直線往復運動を２ ｍ／ｗｉｎの速度とした。EXAMPLE First, the contact surface 13 of the piston body 12 having the cavity 11 of a 4-cycle diesel simple test engine with a bore diameter of 130 m+ was roughened. Next, 8 Qwt from the plasma spray gun 15 attached to the powder feeding boat 14.
%Ni-Cr sprayed particles 16 along with a plasma jet 17. A sprayed coating 18 of 80 wt % Ni--Cr having a thickness of 0.2 m was formed on the roughened ignition surface 12 (as shown in FIG. 1(a)). The Bra-Zuma thermal spraying conditions at this time were: plasma arc current 800A, plasma arc voltage 40cm, plasma gas; Ar50j2/min +
1He20λ/1n, spraying distance 120M,
The piston body 12 was rotated around its axis at 100 rms, and the plasma spray gun 15 was linearly reciprocated through the axis of the piston body 12 at a speed of 2 m/win.
次いで、前記と同様な条件で厚さ０．５ｍｍのＺｒＯ２
の溶射皮膜をピストン本体１２の８Ｑｗｔ％ｘｒ−ｃｒ
の溶射皮膜１９が被覆された触火面１３に形成した後、
キャビティ１１の側面に同様な条件で厚さ０．５＃のＺ
ｒ０ｚの溶射皮膜２０を形成したく第１図（ｂ）図示）
。Next, ZrO2 with a thickness of 0.5 mm was deposited under the same conditions as above.
The thermal spray coating of 8Qwt%xr-cr on the piston body 12
After forming a thermal spray coating 19 on the covered ignition surface 13,
A Z with a thickness of 0.5# was placed on the side of the cavity 11 under the same conditions.
To form a thermal spray coating 20 of r0z (as shown in FIG. 1(b))
.
比較例１
実施例と同様なピストン本体の粗面処理された触火面に
８Ｑｗｔ％Ｎｉ−Ｃｒの溶射皮膜を形成した後、キャビ
ティ側面にＺｒＯ２の溶剤皮膜を先に形成し、更にピス
トンの前記Ｂ□ｗｔ％Ｎｔ−Ｃｒの溶射皮膜上にＺｒ０
ｚ溶射皮膜を形成した。Comparative Example 1 After forming a thermal spray coating of 8Qwt% Ni-Cr on the roughened contact surface of the piston body similar to that in Example, a ZrO2 solvent coating was first formed on the side surface of the cavity, and then B□wt% Zr0 on the sprayed coating of Nt-Cr
A thermal spray coating was formed.
比較例２
実施例と同様なピストン本体の粗面処理された触火面に
ｓｏｗｔ％Ｎｉ−０ｒの溶射皮膜を形成した後、キャビ
ティ側面とピストンの前記Ｎｉ−Ｃｒの溶射皮膜上に手
動でランダムにＺｒＯ２の溶射皮膜を形成した。Comparative Example 2 After forming a sowt% Ni-0r thermal spray coating on the roughened catalytic surface of the piston body similar to that in Example, a random coating was manually applied to the Ni-Cr thermal spray coating on the cavity side surface and the piston. A ZrO2 spray coating was formed on the surface.
しかして、本実施例、及び比較例１．２のピストンを夫
々ディーゼル単筒試験は関に組込み、軸馬力８０ ｐｓ
、軸回転数２１００ ｒｐｍの運転条件で耐久試験を行
った。その結果、本実施例のピストンの溶射皮膜は５０
０時間の解放点検で異常は認められなかった。これに対
し、比較例１のビス１−ンの溶射皮膜では２０時間の解
放点検で既にキャビティ上面の溶射皮膜に顕著な割れと
剥離が発生していた。また、比較例２のピストンの溶射
皮膜では同様に２０時間の解放点検で既にキャビティ上
面の溶射皮膜に割れが発生し、剥離も一部生じていた。Therefore, the pistons of this example and comparative example 1.2 were installed in a diesel single cylinder test, and the shaft horsepower was 80 ps.
A durability test was conducted under operating conditions of , shaft rotation speed of 2100 rpm. As a result, the thermal spray coating on the piston of this example was 50%
No abnormalities were found during the 0-hour release inspection. On the other hand, in the case of the thermal sprayed coating of BIS1-N of Comparative Example 1, significant cracking and peeling had already occurred in the thermal sprayed coating on the upper surface of the cavity after 20 hours of open inspection. Furthermore, in the thermal sprayed coating of the piston of Comparative Example 2, cracks had already occurred in the thermal sprayed coating on the upper surface of the cavity and some peeling had also occurred during the 20-hour open inspection.
このように本発明方法によって形成されたピストン触火
面上の溶射皮膜の中で、ピストン上面を最初に形成して
いるので、ピストン本体と溶射皮膜の境界は健全であり
、密着性も良好となる。一方、キャビティ側面上に形成
された溶射皮膜のピストン本体の境界部は、その前のピ
ストン上面の溶射時に付着したヒユーム等で汚染されて
おり、健全性は低く、密着性もピストン上面のそれより
劣る。しかし、ピストンの触火面の溶射皮膜は、運転中
に火炎に加熱され、圧縮応力が加わる。その結果、キャ
ビティ上面に形成された溶射皮膜には剥離する力が加わ
るものの、キャビティ側面に形成された溶射皮膜は円環
状であり、剥離する力は加わらない。従って、運転中に
剥離する力の加わる部分の密着性を良好とし、剥離する
力の加わらない部分にのみ溶接ヒユーム等の汚染の影響
を与えないので、運転によって溶射皮膜が剥離すること
が防止され、耐久性の優れた溶射皮膜を形成できる。As described above, since the upper surface of the piston is formed first among the thermally sprayed coatings on the piston contact surface formed by the method of the present invention, the boundary between the piston body and the thermally sprayed coating is sound and the adhesion is good. Become. On the other hand, the boundary between the thermal sprayed coating formed on the side surface of the cavity and the piston body is contaminated with fume etc. that adhered during the previous thermal spraying on the top surface of the piston, and the integrity is low, and the adhesion is worse than that on the top surface of the piston. Inferior. However, the thermally sprayed coating on the contact surface of the piston is heated by the flame during operation and is subjected to compressive stress. As a result, although a peeling force is applied to the thermal sprayed coating formed on the upper surface of the cavity, the thermal sprayed coating formed on the side surface of the cavity has an annular shape and no peeling force is applied to the thermal sprayed coating formed on the side surface of the cavity. Therefore, the adhesion is good in the areas where peeling force is applied during operation, and contamination such as weld fumes is not affected only in the areas where peeling force is not applied, so the thermal sprayed coating is prevented from peeling off during operation. , it is possible to form a thermal spray coating with excellent durability.
（発明の効果）
以上詳述した如く、本発明によればピストンの触火面に
耐久性の優れた溶射皮膜を形成することによって、内燃
機関に好適な耐熱、断熱性が向上されたピストンを得る
ことが可能な溶射皮膜形成方法を提供できるものである
。(Effects of the Invention) As detailed above, according to the present invention, a piston with improved heat resistance and heat insulation properties suitable for internal combustion engines can be obtained by forming a highly durable thermal sprayed coating on the contact surface of the piston. It is possible to provide a method for forming a thermal spray coating that can be obtained.
第１図（ａ）、（ｂ）は本発明の実施例における溶射皮
膜形成工程を示す断面図、第２図は従来のディーゼルエ
ンジンの燃焼室を示す断面図である。
１１・・・キャビティ、１２・・・ピストン本体、１３
・・・触火面、１５・・・プラズマ噴射ガン、１８・・
・８０％Ｎｉ−Ｃｒの溶射皮膜、１９・・・ＺｒＯ２の
溶射皮膜。
出願人復代理人 弁理士 鈴江武彦
マ
第１図FIGS. 1(a) and 1(b) are cross-sectional views showing a thermal spray coating forming process in an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a combustion chamber of a conventional diesel engine. 11... Cavity, 12... Piston body, 13
...Touch surface, 15...Plasma injection gun, 18...
- 80% Ni-Cr thermal spray coating, 19...ZrO2 thermal spray coating. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1
Claims (1)
する方法をおいて、前記ピストンの被溶射面を粗面処理
した後、該ピストンの上面を溶射し、ひきつづき前記キ
ャビティの側面を溶射して溶射皮膜を形成することを特
徴とするピストンの溶射皮膜形成方法。A method of forming a thermal spray coating on a contact surface of a piston having a cavity, the surface of the piston to be thermally sprayed is roughened, the top surface of the piston is thermally sprayed, and the side surface of the cavity is subsequently thermally sprayed. A method for forming a thermal spray coating on a piston, the method comprising forming a coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59249130A JPS61126360A (en) | 1984-11-26 | 1984-11-26 | Forming method of flame sprayed film on piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59249130A JPS61126360A (en) | 1984-11-26 | 1984-11-26 | Forming method of flame sprayed film on piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61126360A true JPS61126360A (en) | 1986-06-13 |
| JPH0364700B2 JPH0364700B2 (en) | 1991-10-08 |
Family
ID=17188373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59249130A Granted JPS61126360A (en) | 1984-11-26 | 1984-11-26 | Forming method of flame sprayed film on piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61126360A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1898065A1 (en) * | 2006-08-18 | 2008-03-12 | Wärtsilä Schweiz AG | Piston for two stroke large diesel engine and two stroke large diesel engine |
| JP2009536712A (en) * | 2006-05-10 | 2009-10-15 | フェデラル−モーグル コーポレイション | Thermal oxidation protective surface for steel piston |
| WO2013013830A1 (en) * | 2011-07-28 | 2013-01-31 | Mahle International Gmbh | Bowl rim and root protection for aluminum pistons |
| JP2013185200A (en) * | 2012-03-07 | 2013-09-19 | Mazda Motor Corp | Thermal insulation coating structure and method for producing the same |
| JP2014020283A (en) * | 2012-07-18 | 2014-02-03 | Isuzu Motors Ltd | Piston structure of internal combustion engine |
| JP2015518536A (en) * | 2012-03-28 | 2015-07-02 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Method for manufacturing aluminum piston |
-
1984
- 1984-11-26 JP JP59249130A patent/JPS61126360A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009536712A (en) * | 2006-05-10 | 2009-10-15 | フェデラル−モーグル コーポレイション | Thermal oxidation protective surface for steel piston |
| EP1898065A1 (en) * | 2006-08-18 | 2008-03-12 | Wärtsilä Schweiz AG | Piston for two stroke large diesel engine and two stroke large diesel engine |
| WO2013013830A1 (en) * | 2011-07-28 | 2013-01-31 | Mahle International Gmbh | Bowl rim and root protection for aluminum pistons |
| JP2013185200A (en) * | 2012-03-07 | 2013-09-19 | Mazda Motor Corp | Thermal insulation coating structure and method for producing the same |
| JP2015518536A (en) * | 2012-03-28 | 2015-07-02 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | Method for manufacturing aluminum piston |
| JP2014020283A (en) * | 2012-07-18 | 2014-02-03 | Isuzu Motors Ltd | Piston structure of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0364700B2 (en) | 1991-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |